In a Gallup study of 200 hospitals, they found that the engagement level of nurses was the number one variable correlating to mortality, even beating out the number of nurses per patient day.

Another review of engagement and clinical outcomes at the NHS in England showed that for every 10% increase in engagement there was a reduction in MRSA by .057 cases per 10,000 bed days and one standard deviation improvement in engagement reduced mortality by 2.4 percentage points. The same study showed a strong correlation between engagement and reducing staff turnover and absenteeism